Skiving-machine.



L. W. G. FLYNT.

SKIVING MACHINE. APYLIOATION FILED JULY 1909.

1,017,963. Patented Feb.20,1912.

'M C?. A jf UNITED STATES PATENT OFFICE.

LOUIS W. G. FLYNT, OF ROCHESTER, NEW YORK, ASSIGNOR TO QUENTIN W. BOOTH,OF ROCHESTER, NEW YORK.

SKIVING-MACHNE.

To all whom 'it may concern:

Be it known that I, LoUIs W. Gr.' FLYNT, a subject of the King ofEngland, residing at Rochester, in the county of Monroe and State of NewYork, have invented certain Improvements in. Skiving-Machines, of whichthe following description, in connection with the accompanying drawings,is a specifica-A tion, like reference characters on the drawingsindicating like parts in the several figures.

This invention relates to skiving machines, more particularly tomachines of this class wherein a knife having a circular edge isemployed; and is herein shown as embodied in a skiving machine in whichby the employment of a feed roll of particular form a substantiallystraight bevel is produced on the stock, it being especially welladapted for use with this type of machine. It should be understood,however, that its usefulness is not confined to the particular type ofmachine shown.

It is desirable that means be provided for pressing all points in thatportion .of the moving work which is about to be fed to the knife withequal force against the surface of the feed roll in order that thefeeding of the work may be uniform, and one object of the presentinvent-ion is to bring about such a pressure.

The machine chosen for illustration com prises a knife having a circularedge together with an angularly adjustable feed roll having a concaveworking face the curvature of which corresponds tol that of the edge ofthe knife in such a manner that when the axis of the roll is at itsleast inclination the edge of the knife is parallel to the adjacentsurface of the roll. Accordingly, a segmental presser foot is providedthe inner, lower, operative edge of which is struckfrom a centercoinciding with that of the knife. It will be clear, therefore, thatsince the edge of the operative portion of the knife follows the contourof the roll in one position of the roll, the operative edge of thepresser foot will likewise follow it. In actual work, however, the rollis angularly adjusted as stated above so that the edge of the knifesteadily recedes from the surface of the roll in order that a straightbevel may be produced. The presser finger, on the other hand, should inmost cases be parallel to the adjacent surface of the roll in orderSpecification of Letters Patent.

Application filed July 8, 1909.

Patented Feb. 20, 1912.

serian No. 506,525. l

that it may exert equal pressure upon all' points in the stock enga-gedlby it. Accordingly, the' presser foot is mounted upon the feed rollcarrier so that as the feed roll is adjusted angularly the presser footis adjusted with it and the relation of the two remains unchanged.

It is sometimes desirable, for example, in reskiving stock, that arelation other thany that of parallelism be maintained between theoperative portion of the presser foot and the adjacent surface of thefeed roll, and a further object of this vinvention is to provide meanswhereby such a relative position may be attained. This may beaccomplished in any convenient manner, and in the illustrated embodimentthe presser foot is made angularly adjustable about a pivot which isitself bodily adjustable so that the presser foot can be moved for acertain distance transversely across the surface of the feed roll. Asthe result of such movement the center of curvature of the segmentalpresser foot no longer coincides exactly with the center of curvature ofthe knife and conse: quently the operative portion of said foot is nolonger parallel to the adjacent surface of the roll.

In certain circumstances, for example, whena change is made from a widefeed roll to a narrower one or vice versa, it is desirable that thepresser foot be adjustable in such a manner that its proper positionwith respect to the feed roll may be maintained.

Accordingly, another object of this invention is to provide means foradjusting the segmental presser foot circularly about the center oftheknife and for holding it in adjusted position. This means in theillustrated embodiment comprises a segmental guideway the curvature ofwhich corresponds to that of the presser foot and a. clamp for holdingsaid presser foot in position.

These and other features of the invention including certain details ofconstruction and combinationsV of parts will be explained in connect-ionwith the following' description of a machine and will be pointed outmore definitely in the claims.

Referring now to the accompanying draw- I a side elevation of theimproved presser foot together with portions of the adjacent parts ofthe machine, certain parts of the feed roll carrier being broken away.Fig. 3 is a plan view of the parts shown in Fig. 2, the yoke of thepresser foot carrier and the adjacent portion of the feed roll carrierbeing shown in section. F ig. 4L is a section on the line 4 4 of Fig. 3showing the means whereby the presser foot may be circularly adjusted.Fig. is a perspective showing the position of the presser foot withrespect to the knife, the feed roll and the guard disk; and Fig. 6 is aperspective of a modified form of presser foot.

Upon a base 1 is mounted a frame 3 which in turn carries a head 5, saidhead being adjustable vertically and also angularly about the axis ofthe shaft 7. Extending upwardly through the base, frame and head is saidshaft 7 carrying a pulley 9 at its up per end; and from this pulley isdriven a knife 11 through the medium of a belt 13 and a sleeve 15 whichis connected to the knife spindle. 1n the frame 3 of the machine ismounted a feed roll carrier 17 which is formed with a bearing for theshaft 19 of a feed roll 21. means of a gear Q3 which meshes with a wormon an upright shaft 27. The teeth of the gear 23 are chamfered orbeveled, as shown, so that the feed roll carrier 17 may be angularlyadjusted without throwing said gear out of mesh with the worm The feedroll carrier 17 is formed on its inner side with a groove 29 which fitsover a correspondingly shaped guide formed on the frame of the machine,angular' adjustment of the carrier 17 on this guide being effected bymeans of a fixed rack 31 and a coperating pinion 33 the shaft of whichextends through a slot 85 in the frame and is rotatably mounted in thefeed roll carrier. Extending upwardly from the feed roll carrier 17 is abracket 37 in which is adjustably mounted a rod 39 carrying at its outerend a tubular bearing 41 for the spindle 13 of a guard disk 45. Theupright shaft 27 is driven by means of a friction device 47 and a pulley49, said friction device being controlled by ay lever 51 operated by atreadle (not shown). A belt connects the pulley 419 with the pulleywhich drives the shaft 7. The object of the driving mechanism describedabove is to permit the speed of rotation of the feed roll to be variedindependently of the speed of rotation of the knife.

The construction of the machine outlined above will not be taken up morein detail since it is set forth and claimed in my previous application,Serial No. 313,775. It. should be observed, however, that the machine isprovided with a knife the spindle of which is fixed against tiltingmovement,

The feed roll is driven by with an angularly adjustable feed roll, andwith means for actuating said knife and roll. The particular roll shownis also set forth in my previous application above referred to, butinasmuch as up to this time the present invention has found its bestapplication in combination with a roll of this kind, said roll will nowbe described.

1n machines of this class hitherto used having a circular knife and inwhich the work is supported and fed by a revolving cylinder or cone theopening between the knife and the work support does not progressregularly from the narrower to the wider portion so that a straightbevel will be produced on the work, but opens from the narrower to thewider portion in a steadily increasing ratio dependent upon the diameterof the knife and that of the work support. The effect of this, morenoticeable in a wide skive than in a narrow one, is to produce a curvedinstead of a straight bevel.

In order to produce a substantially straight bevel the surface of thefeed roll in the present machine is formed with a concavity whichcorresponds, in a manner pres ently to be described, to the cutting edgeof the circular knife and is made adjustable about a particular axis.This concavity of the surface of the feed roll can best be defined bystating that it is the concavity which would be produced were the knifereplaced by a milling critter of the same diameter and caused to milloff a portion of the rotating roll, the axis of said roll being heldduring the operation at the least angular inclination which it assumesin the skiving machine. It is clear now that if the milling cutter werereplaced by the disk knife all points in that portion of the edge of theknife which were located above the feed roll at any instant would beequidistant from said surface. In fact, the edge of this portion of theknife would substantially coincide with the adjacent surface of theroll, thus a relation of knife to feed roll is obtained which does notexist when a cylindrical or conical feed roll is used, since in theselatter cases the curvature of the roll about its axis tends to make thesurface of said. roll fall away, so to speak, from the receding curvededge of the knife. As stated, the feed roll of the illustrated machinehas a concave working face the curvature of which is determined by thecurvature of the edge of the knife as described above, said roll beingshown most clearly 1n Fig. It should be noted that this roll may also besaid to be one in which the diameter increases from one end to theother, the in crease being dependent upon the diameter of the knife.

Having obtained a relation of knife and roll such that all points in theoperative portion of the edge of the knife at any given instant areequidistant from the surface of the roll it only remains to make theroll adjustable about a proper center or axis in order to adapt themachine to the production of straight bevels of various angles. Thiscenter is substantially that point in the edge of the roll at the endhaving the smaller diameter which is nearest the cutting edge of theknife. Or to locate the center in another manner it is approximately thepoint at which the edge of the stock adjacent the gage meets the knifeas said stock is being skived. This point is indicated at X in Fig. l.

In order that the work may be properly fed to the knife it is desirablethat it be pressed against the roll with a pressure which is uniformthroughout the portion upon which it is exerted. Accordingly, asegmental presser foot 57 is provided, said presser foot being of theform of an arc struck from a center which coincides with the center ofthe circular cutting edge of the knife. This presser foot is shown incross section on an enlarged scale in Fig. t, and it will be seen thatit approximates a quadrant in section, the curved portion -being of suchform as will permit the work to be readily fed beneath it. It should benoticed that the operative portion of this presser foot is acomparatively thin edge and that since said edge is parallel to theadjacent edge of the knife it is consequently parallel to the adjacentsurface of the feed roll when the axis of said roll stands at its leastinclination.

In act-ual use, as has been mentioned, the feed roll is tilted about anaxis passing through the point X in order to vary the angle of theskive; and in order that the relation of parallelism between theoperative portion of the presser foot and the adjacent surface of thefeed roll may be maintained, said presser foot is so mounted that it maybe adjusted with said carrier. Any convenient means for accomplishingthis may be employed, and in the illustrated embodiment the presser footis mounted upon the carrier so as to partake of the movement of thelatter. Again this mounting may be accomplished in any suitable manner;and in the preferred form the presser foot is pivoted to the feed rollcarrier by means of a bolt 59 which passes through the forks 61, 63 of apresser foot carrier 65, while a yielding device maintains the presserfoot in engagement with the work. This yielding device comprises atubular member 67 screwthreaded through the presser foot carrier andabutting the feed roll carrier so as to limit the downward movement oft-he presser foot; a headed bolt 69 passing freely through said tubularmember and provided at its upper end with screw threads which areengaged by a thumb nut 71; a spring 73, and a perforated cap 75screw-threaded into the upper wall of a cavity in the feed roll carrier.

It sometimes happens that it is desirable to disturb the parallelrelation which normally prevails between the operative portion of thepresser footvand the adjacent surface of the feed roll, for example,when it is desired to re-skive the work or when for any reason theportion of the work which is engaged by the presser foot is not ofuniform thickness. In order, then, to produce an angular opening betweenthe presser vfoot and the working face of the feed roll the pivot bolt59 is arranged for adjustment with respectto the feed roll carrier asfollows A bore 77 is provided through the bracket 37 of the feed rollcarrier, said bore being of greater diameter than that of said bolt. Theforks 61 and 63 have alined bores which receive flanged bushings 79, andthese bushings are clamped in adjusted position by means of a thumbscrew 8l threaded on one end of said bolt and a head 83 integral withthe other end. It should be noted that the bore in the top of the cap 75is of greater diameter than the headed bolt 69, so that longitudinalmovement of the presser foot is not prevented. It should also be notedthat the pivot bolt 59 is adjustable both vertically and horizontallyand that the outline o-f` the face 85 of the presserfoot carrier whichabuts the feed roll is an arc struck from a point in the axis of thepivot bolt 59. Owing to this arc-shaped outline, if for any reason thepivot bolt 59 is raised, a space is created between this curved face 85and the end of t-he feed roll. Since, however, this curved face acts asa gage for the edge of4 the work as it is fed through the machine itbecomes necessary to move theface 85 up to the feed roll, and thisillustrates a further condition wherein longitudinal adjustment of thepresser foot is advantageous. Besides this longitudinal adjustment ofthe presser zfoot a second adjustment which will be termed circular isprovided for to accommodate said presser foot to rolls of differentwidths. In order to permit this circular adjustment a segmental guidewayis formed in the presser foot carrier in which said presser foot is heldby means of a bolt 87 provided at one end with a hook and at the otherwith threads which are engaged by a nut 89, it being apparent that byloosening the nut the segmental presser foot may be moved along in theguideway.

In opera-tion, the thumb nut on t-he tubular member 67 is adjusted tothe desired position, and the thumb nut 7l adjusted to obtain the propertension of the spring 73. The nut 89 is then loosened and the segmentalmember 57 moved circularly to the desired position after which the nut-89 is again tightened. If now for any reason it becomes necessary ordesirable to adjust the position of the pivot bolt the adjustment ismade in the manner indicated above. The machine is then started, and thework fed between the presser foot and the roll with its edge against theface S5 of the presser foot carrier which, as above stated, serves as agage.

In Fig. 6 is shown a modified form of the invention wherein thesegmental presser foot is not pivoted to the feed roll carrier but ismounted for sliding movement only. In this construction the presser footcarrier 165 is provided with an extension 166 which is adapted to slidein a guideway indicated in Fig. 2 by dotted lines at 91. In thiseXtension are two elongated openings 168 and 170. The former is providedfor the passage of one of the screws which fastens to the feed rollcarrier the plate (not shown) againstwhich the inner end of the feedroll bears, while the latter is provided for the passage of the feedroll shaft. The headed bolt 169, the nut 171 for regulating the tensionof the spring, the tubular member provided with the nut 167 for limitingthe downward movement of the presser foot, the hooked bolt 187 and t-hepresser foot 157 are similar to the corresponding parts in the preferredform.

wWith regard to the circular adjustment of the presser foot which isprovided for in both forms of the invention, attent-ion is directed tothe fact that the means whereby said adjustment is permitted isparticularly satisfactory since said foot is compelled to move in acircular path about its center of curvature so that its relation to theknife and roll is changed only in the desired particular.

The invention has been set forth in connect-ion with a particularmachine, but nothing herein contained is to be construed as limiting theinvent-ion in the scope of its application to the specific machine shownand described.

Having thus described my invention, what I claim and desire to secure byLetters Patent of the United States is 1. A machine of the classdescribed, having in combination, a disk knife, a feed vroll having aconcave working face, means for actuating said knife and roll and meansfor pressing all points in that portion of the moving work which isabout to fed to the knife with equal force against the working face ofthe feed roll.

2. A machine of the class described, having in combination, a diskknife, a feed roll having a concave working face, means for actuatingsaid knife and roll, and an arcshaped presser foot the operative edge ofwhich is parallel to the edge of the knife.

3. A machine of the class described, having in combination, a diskknife, al feed roll having a concave working face the curvature of whichis determined by the curvaj ture of the knife, means for actuating saidknife and roll, and a presser foot having all points in its operativeedge equidistant from the adjacent surface of the roll.

4. A machine of the class described, having in combination, a diskknife, a feed roll the diameter of which increases from one end to theother, the increase being dependent upon the diameter of the knife,means for actuating said knife and roll, and a presser foot having anoutline corresponding to that of the knife.

5. A machine of the class described, having in combination, a knife, aconcave feed roll, means for angularly adjusting said roll about a pointwhich coincides approximately with the uppermost pointon the in ner edgeof said roll, a segmental presser foot also angularly adjustable aboutthe same point, and means for actuating said knife and roll.

6. A machine of the class described, having in combination, a knife, aconcave feed roll, a carrier in which said roll is mounted, said carrierbeing angularly adjustable, a segmental presser foot mounted upon saidcarrier and means for actuating said knife and roll.

7 A machine of the class described, having in combination, a knife, afeed roll having a concave working face, means for angularly adjustingsaid roll about an aXis which coincides approximately with the edge ofthe work as it is being fed through the machine, a segmental presserfoot adjustable with. said roll, and means for actuating said knife androll.

8. A machine of the class described, having in combination, a knife, aconcave feed roll, an angularly adjustable carrier in which said roll ismounted, a segmental presser foot pivoted to said carrier, and means foractuating said knife and roll.

9. A machine of the class described, having in combination, a knife, aconcave feed roll, an angularly adjustable carrier in which said roll ismounted, a segmental presser foot pivoted to said carrier, means wherebythe pivot may be bodily adjusted, and means for actuating said knife androll.

10. A machine of the class described, having in combination, a diskknife, a concave feed roll, a segmental presser foot, a bodily movablepivot about which said foot is angularly adjustable, and means foractuating said knife and roll.

11. A machine of the class described, having in combination, a knifehaving a circular edge, means for feeding work to said knife, asegmental presser foot, and means whereby said foot may be adjustedcircularly about the edge of said knife, said means being constructedand arranged to prevent movement in any other path during theadjustment.

12. A machine of the class described having, in combination, a diskknife, a feed roll having a concave working face, means for actuatingsaid knife and roll, a segmental presser foot the operative face ofwhich is normally parallel to the adjacent surface of the feed roll andmeans whereby said par- 'allel relation may be destroyed.

13. A machine of the class described having, in combination, a diskknife, a feed roll having a concave working face, means for actuatingsaid knife and roll, a segmental presser foot the operative face ofwhich is normally parallel to the adjacent surface of the feed roll andmeans including a bodily adjustable pivot for varying the position ofsaid foot with respect to said roll.

14. A machine of the class described llaving, in combination, a knife, afeed roll, means for actuating said knife and roll, a presser foot, anarm upon which said foot is mounted, a pivot about which said arm isadjustable, said pivot being capable of bodily movementin twodirections, and means for adjusting said foot angularly about said pivotwhile maintaining said pivot stationary.

15. A machine of the class described having, in combination, a knife, afeed roll, means for actuating said knife and roll, a presser foot, anedge gage, an arm upon which said foot and gage are Carried, and avertically and laterally adjustable pivot supporting one end of saidarm.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

LOUIS W. Gr. FLYNT.

Witnesses:

FRED. C. PATRICK, QUENTIN W. BOOTH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

